US11348486B2 - Flexible display device - Google Patents
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- US11348486B2 US11348486B2 US16/642,048 US201916642048A US11348486B2 US 11348486 B2 US11348486 B2 US 11348486B2 US 201916642048 A US201916642048 A US 201916642048A US 11348486 B2 US11348486 B2 US 11348486B2
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Images
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
- H10K77/111—Flexible substrates
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- H01L51/0097—
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/311—Flexible OLED
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Definitions
- the present disclosure relates to the technical field of display, in particular to a flexible display device.
- Flexible display devices are display devices which are made of flexible materials and are flexible. Due to the excellent display characteristics such as flexibility and lightness, the flexible display devices can be applied to many fields such as wearable devices, mobile devices and augmented reality and virtual technology devices and are considered to be the mainstream in future display fields.
- Flexible display devices are usually made into a structure that can be rolled up or folded in a non-operating state and unfolded during operation.
- substrate materials of the flexible display devices are liable to be damaged during a manual rolling-up/folding process, and after long-term folding/rolling-up storage, problems such as irreversible deformation, creasing or warping also occur, which lead to unevenness after the substrate materials are unfolded, thus display effects of displays are affected. Meanwhile, the unevenness of substrates also affects the working characteristics and the service life of internal structures of the displays, and therefore the reliability of the displays is reduced.
- the present disclosure provides a flexible display device.
- the specific solution is as follows.
- the flexible display device includes:
- a flexiblity-rigidity transformation layer disposed on one side of the flexible substrate, where,
- the flexiblity-rigidity transformation layer includes an electrode layer and a transformation film capable of transforming between a flexiblity state and a rigidity state under the action of an electric field; and the electrode layer is used for generating the electric field for driving the transformation film to transform between the flexiblity state and the rigidity state.
- the present disclosure provides the flexible display device.
- the above flexible display device includes the flexible substrate and the flexiblity-rigidity transformation layer formed on one side of the flexible substrate.
- the flexiblity-rigidity transformation layer includes the transformation film and the electrode layer. Specifically, after the electrode layer generates the electric field for transforming the transformation film from the flexiblity state to the rigidity state, the transformation film stretches in a direction perpendicular to the electric field, the elastic modulus changes, a film layer stretches and is paved flatly, and since the flexiblity-rigidity transformation layer is formed on the flexible substrate, the flexible substrate is paved flatly correspondingly, and thus the effect of flattening the flexible substrate can be achieved.
- the transformation film in the electric field can be transformed from the rigidity state to the flexiblity state by adjusting the electrode layer, then the flexible substrate loses support, and thus a user need of rolling-up or bending the flexible display device can be met.
- elastic parameters of the transformation film can be changed under the action of the electric field, and the transformation film is changed from the flexible layer to the rigid layer, so that planarization of the flexible substrate is achieved.
- FIG. 1 is a schematic structural diagram of a flexible display device provided by embodiments of the present disclosure
- FIG. 2 is another schematic structural diagram of the flexible display device provided by an embodiment of the present disclosure
- FIG. 3 is a schematic structural diagram of Structure 1 provided by an embodiment of the present disclosure.
- FIG. 4 is a schematic structural schematic diagram of Form 1 provided by an embodiment of the present disclosure.
- FIG. 5 is a schematic structural diagram of Structure 2 provided by an embodiment of the present disclosure.
- FIG. 6 is a schematic structural diagram of Form 3 provided by an embodiment of the present disclosure.
- FIG. 7 is a schematic structural diagram of Form 4 provided by an embodiment of the present disclosure.
- FIG. 8 is another schematic structural diagram of the display device provided by an embodiment of the present disclosure.
- FIG. 9 is another schematic structural diagram of the display device provided by an embodiment of the present disclosure.
- FIG. 10 is a flowchart of the flexible display device provided by an embodiment of the present disclosure.
- the present disclosure provides a flexible display device, as shown in FIG. 1 , including:
- a flexiblity-rigidity transformation layer 2 disposed on one side of the flexible substrate 1 , where,
- the flexiblity-rigidity transformation layer 2 includes: an electrode layer 22 and a transformation film 21 capable of transforming between a flexibility state and a rigidity state under the action of an electric field; and the electrode layer 22 is used for generating the electric field for driving the transformation film 21 to transform between the flexiblity state and the rigidity state.
- the present disclosure provides the flexible display device.
- the flexible display device includes the flexible substrate 1 and the flexiblity-rigidity transformation layer 2 formed on one side of the flexible substrate 1 .
- the flexiblity-rigidity transformation layer 2 includes the transformation film 21 and the electrode layer 22 .
- the transformation film 21 stretches in a direction perpendicular to the electric field, the elastic modulus changes, the film layer stretches and is paved flatly, and since the flexiblity-rigidity transformation layer 2 is formed on the flexible substrate 1 , the flexible substrate 1 is paved flatly correspondingly, and thus the planarization of substrate 1 can be achieved; and afterwards, the transformation film 21 in the electric field can be transformed from the rigidity state to the flexiblity state by adjusting the electrode layer 22 , the flexible substrate 1 loses support at the moment, and therefore a user need of rolling-up or bending the flexible display device can be met.
- Elastic parameters of the transformation film 21 of the flexible display device provided by the present disclosure can be changed under the action of the electric field, and a flexible layer is changed into a rigid layer, so that planarization of the flexible substrate 1 is achieved.
- damage of the flexible substrate during repeated rolling-up and unfolding processes can be reduced, so that the service life of the display device is prolonged, and the display quality is improved.
- the service life of the flexible substrate 1 can be prolonged, a display effect of the display device can be improved, and the reliability of the display device can be improved.
- the flexible substrate 1 is provided with a display component 3
- the display component 3 may be an organic electroluminescent display device or a flexible liquid crystal display device, etc.
- the display component 3 can specifically and structurally includes a thin film transistor switch 31 , a light emitting layer 32 , an encapsulation layer 33 and a protective layer 34 which are sequentially arranged in a direction facing away from the flexible substrate 1 .
- the display component 3 may further be internally provided with a control chip for controlling a normal display function of the display component 3 , which is not specifically limited herein.
- the flexiblity-rigidity transformation layer 2 can be disposed between the flexible substrate 1 and the display component 3 , or the flexiblity-rigidity transformation layer 2 can be disposed on one side, facing away from the flexible substrate 1 , of the display component 3 , or the flexiblity-rigidity transformation layer 2 is disposed on one side, facing away from the display component 3 , of the flexible substrate 1 .
- the arrangement that the flexiblity-rigidity transformation layer 2 is disposed on one side, facing away from the display component 3 , of the flexible substrate 1 is selected.
- the flexible substrate 1 may be made of an organic or inorganic flexible material, and specifically, may be made of polyimide, polyethylene naphthalate, polyethylene glycol terephthalate, a metal film or other bendable substrate materials, which is not specifically limited herein.
- the transformation film 21 in the flexiblity-rigidity transformation layer 2 may be made of a dielectric elastic material, and the elastic parameters may change when power is applied, and the transformation film 21 is transformed from the flexiblity state to the rigidity state.
- preparation materials of the transformation film 21 may be selected from polymer materials such as silicone rubber materials, acrylate materials and carbon nanotube materials, and in an actual preparation process, a precursor material is coated by the methods such as screen printing, surface coating and digital printing and cured into a film by thermal curing or ultraviolet curing.
- a preparation material of the electrode layer 22 may be a non-metallic conductive material, such as indium tin oxide, aluminum-doped zinc oxide or other non-metallic conductive materials, and a film can be made by the methods such as splashing and evaporation when the non-metallic conductive material is adopted, or the preparation material of the electrode layer 22 may be a metal conductive material, such as Au, Ag Cu and Fe, and a film can be made by the methods such as evaporation when the metal conductive material is adopted.
- the flexiblity-rigidity transformation layer 2 can be formed in various structures, and specifically in at least one of the following structures:
- the transformation film 21 includes a plurality of transformation units, the plurality of transformation units are arranged in a rollable direction of the flexible substrate 1 , and the transformation units are insulated from each other.
- the plurality of transformation units allow regional control on planarization of the flexible substrate 1 .
- Each transformation unit can control the planarization of the part, corresponding to the transformation unit, of the flexible substrate 1 , and intervals of the plurality of transformation units are determined by the insulation characteristics of an insulating material, which is not limited here.
- the electrode layer 22 may be arranged in a plurality of forms, and arranged in at least one of the following two forms:
- the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222 , and the first electrode layer 221 includes a plurality of first electrode units corresponding to the transformation units in a one-to-one manner, and the transformation units are disposed between the corresponding first electrode units and the second electrode layer 222 .
- the first electrode layer may be an anode layer, and the second electrode layer is a cathode layer; or the first electrode layer is a cathode layer, and the second electrode layer is an anode layer.
- the first electrode units are disposed on one side, facing away from the flexible substrate 1 , of the transformation units, and the second electrode layer 222 is disposed on one side, facing to the flexible substrate 1 , of the transformation film 21 .
- the transformation film 21 includes one transformation unit.
- the transformation film 21 includes only one transformation unit, that is, the whole transformation film 21 is paved on one side of the flexible substrate 1 to allow the planarization of the flexible substrate 1 .
- the electrode layer 22 may be arranged in a plurality of forms and arranged in at least one of the following two forms:
- the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222 , and the first electrode layer 221 and the second electrode layer 222 are disposed on two sides of the transformation film 21 respectively.
- the electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222 , the first electrode layer 221 and the second electrode layer 222 are disposed on the same side of the transformation film 21 , the first electrode layer 221 includes a plurality of first electrode units, the second electrode layer 222 includes a plurality of second electrode units, and the plurality of second electrode units and the plurality of first electrode units are arranged at intervals and are alternately arranged on the same layer.
- the first electrode layer 221 and the second electrode layer 222 may be formed by etching or coating.
- the flexiblity-rigidity transformation layer 2 further includes a planarization layer 23 for improving flatness, and the planarization layer 23 is disposed on one sides, facing away from the flexible substrate 1 , of the transformation film 21 and the electrode layer 22 , as shown in FIG. 4 , FIG. 6 and FIG. 7 , for example.
- the planarization layer 23 is disposed on outermost layers of all film layers of the flexiblity-rigidity transformation layer 2 .
- planarization layer 23 inorganic films such as silicon nitride films or other organic films with protective effects may be used as the planarization layer 23 , and a specific preparation method may be a plasma enhanced chemical vapor deposition method, an atomic layer deposition method or other methods.
- the flexiblity-rigidity transformation layer 2 may further include a control module 24 responsible for outputting a signal required for transformation of the transformation film 21 between the flexiblity state and the rigidity state.
- the electric signal output by the control module 24 can be transmitted to the electrode layer 22 through an electric wire and applied to the transformation film 21 , as illustrated in FIG. 8 and FIG. 9 .
- the electric signal output by the control module 24 may be a pulse signal.
- the electrode layer 22 generates an electric field after receiving a pulse voltage signal of the control module 24 , the transformation film 21 stretches in a direction perpendicular to the electric field, the elastic modulus changes, the film layer stretches and is paved flatly, since the flexiblity-rigidity transformation layer 21 adheres to the flexible substrate 1 , the flexible substrate 1 is paved flatly correspondingly, and thus the effect of planarization of the flexible substrate can be achieved.
- the transformation film 21 can maintain rigidity for a certain period of time after being applied with the electric signal until next pulse voltage is applied, the interval time of applying the pulse voltage should be shorter than or equal to the rigidity maintaining time of the transformation layer, and the specific interval time and the voltage amplitude need to be comprehensively formulated according to material structures, doping conditions and other conditions.
- control module 24 may also be integrated in a control system or a control chip of the display component 3 of the flexible display device provided by the present disclosure.
- the flexible display device provided by the present disclosure further includes a fixed shaft located at one end of the flexible substrate 1 .
- the flexible substrate 1 has an unfolded state and a rolled-up state with the fixed shaft as a reel.
- the fixed shaft is of a cylindrical structure
- the display component 3 is disposed on one side, facing to the fixed shaft, of the flexible substrate 1 .
- the flexible substrate 1 and the display component 3 and the flexiblity-rigidity transformation layer 2 on the flexible substrate 1 are rolled up around a center point of the fixed shaft.
- the flexible display device provided by the present disclosure further includes a rolling-up device for controlling the flexible substrate 1 to change between the unfolded state and the rolled-up state, and a driving system for driving the action of the rolling-up device.
- the rolling-up device and the driving system are located on the fixed shaft, and the driving system may be selected from an air compression system or other mobile power systems.
- a fixed shaft control system for controlling the operation of the driving system may also be arranged in the fixed shaft.
- the fixed shaft control system may include a control circuit, a mobile control panel, etc.
- a user can adjust the rolling-up, unfolding and projection operations of a display composed of the flexible substrate 1 , the display component 3 and the flexiblity-rigidity transformation layer 2 through the fixed shaft control system, and adjust the actual display size and resolution of the display.
- the user can also roll up the display with the fixed shaft as the center by manual rolling-up.
- the length and radius of the fixed shaft may be fixed, or the size of the fixed shaft may be adjustable in a radial direction; and/or the size of the fixed shaft may be adjustable in an extending direction of the fixed shaft.
- the size of the fixed shaft can be adjusted manually or controlled by a fixed shaft telescopic device, and the specific diameter and length of the fixed shaft are determined according to the minimum curvature radius and the working size of the display, and the driving system can provide power for variations of the length and radius of the fixed shaft and rolling-up/unfolding of the display.
- the length of each transformation unit is shorter than or equal to one-eighth of the minimum circumference of the fixed shaft in a rollable direction of the flexible substrate 1 .
- each transformation unit is shorter than or equal to one-eighth of the minimum circumference of the fixed shaft in the rollable direction of the flexible substrate 1 .
- the flexiblity-rigidity transformation layer 2 may also be applicable to a flexible display device changeable in a folding form or a fixed arc form or other forms.
- the display composed of the flexible substrate 1 , the display component 3 and the flexiblity-rigidity transformation layer 2 is in a rolled-up state, the flexiblity-rigidity transformation layer 2 is not energized, and the film of the flexiblity-rigidity transformation layer 2 is in a flexiblity state;
- the control module 24 outputs an electric signal, all areas of the flexiblity-rigidity transformation layer 2 are energized, the transformation film 21 is transformed from the flexiblity state to the rigidity state, the transformation film 21 is stretched and paved flatly, since the transformation film 21 directly adheres to the flexible substrate 1 , the flexible substrate 1 is paved flatly correspondingly, and the effect of planarization of the flexible substrate 1 can be achieved;
- the control module 24 outputs part of the electric signal according to working areas of the display, the part of corresponding areas of the flexiblity-rigidity transformation layer 2 are energized, the flexible film in the part of areas is transformed from the flexiblity state to the rigidity state, the part of flexible film is stretched and paved flatly, and due to the fact that the flexiblity-rigidity transformation layer 2 directly adheres to the flexible substrate 1 , the flexible substrate 1 is paved flatly correspondingly, and the effect of flattening the flexible substrate 1 can be achieved.
- the work flow of the flexible display device provided by the present disclosure is as follows, referring to FIG. 10 :
- a fixed shaft control system performs calculation according to the display size set by a user and outputs a control signal
- a driving system operates and drives a fixed shaft according to the control signal, so that a display component is unfolded according to the set display size, and the control module outputs an electric signal to an electrode layer in the area corresponding to the set display size according to the control signal;
- the fixed shaft control system performs calculation according to the instruction of rolling the display up input by the user and outputs a control signal
- control module receives the control signal and turns off the electric signal
- the flexible display device provided by the embodiment of the present disclosure includes the flexible substrate and the flexiblity-rigidity transformation layer formed on one side of the flexible substrate; the flexiblity-rigidity transformation layer includes the transformation film capable of transforming between the flexiblity state and the rigidity state under the action of the electric field, and the electrode layer used for generating the electric field used to drive the transformation film to change.
- the elastic parameters of the transformation film of the flexible display device provided by the present disclosure can be changed under the action of the electric field, and the flexible layer is changed into the rigid layer, and therefore, planarization of the flexible substrate is achieved. Through transformation of the transformation film, damage of the flexible substrate during repeated rolling-up and unfolding processes can be reduced, so that the service life of the display device is prolonged, and the display quality is improved.
Abstract
Description
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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CN201810571147.4 | 2018-05-31 | ||
CN201810571147.4A CN108520917A (en) | 2018-05-31 | 2018-05-31 | A kind of flexible display apparatus |
PCT/CN2019/082758 WO2019228088A1 (en) | 2018-05-31 | 2019-04-15 | Flexible display device |
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US20210035476A1 US20210035476A1 (en) | 2021-02-04 |
US11348486B2 true US11348486B2 (en) | 2022-05-31 |
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Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108520917A (en) | 2018-05-31 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of flexible display apparatus |
KR20200070899A (en) * | 2018-12-10 | 2020-06-18 | 엘지디스플레이 주식회사 | Back plate and Rollable Display having the same |
CN112447098A (en) | 2019-09-03 | 2021-03-05 | 群创光电股份有限公司 | Scroll bar type display device and modulation method of scroll bar type display device |
CN113409683B (en) * | 2020-03-17 | 2022-12-09 | 上海和辉光电股份有限公司 | Foldable display device |
CN111402734A (en) * | 2020-03-26 | 2020-07-10 | 武汉华星光电半导体显示技术有限公司 | Flexible display module, preparation method thereof and flexible display device |
CN111415949B (en) * | 2020-04-27 | 2022-07-29 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and manufacturing method thereof |
CN114690462A (en) * | 2020-12-25 | 2022-07-01 | 华为技术有限公司 | Impact protection layer, control method and device, display module and terminal |
CN115050261B (en) * | 2022-05-31 | 2024-03-19 | 武汉华星光电半导体显示技术有限公司 | Display device |
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CN108520917A (en) | 2018-05-31 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of flexible display apparatus |
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US20210035476A1 (en) | 2021-02-04 |
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